//
// @functions
//

// STRIP UNIT
// It strips the unit of measure and returns it
@function strip-unit($num) {
	@return $num / ($num * 0 + 1);
}

// CONVERT TO REM
@function convert-to-rem($value, $base-value: $rem-base) {
	$value: strip-unit($value) / strip-unit($base-value) * 1rem;
	@if ($value == 0rem) { $value: 0; } // Turn 0rem into 0
	@return $value;
}

// REM CALC

// New Syntax, allows to optionally calculate on a different base value to counter compounding effect of rem's.
// Call with 1, 2, 3 or 4 parameters, 'px' is not required but supported:
//
//   rem-calc(10 20 30px 40);
//
// Space delimited, if you want to delimit using comma's, wrap it in another pair of brackets
//
//   rem-calc((10, 20, 30, 40px));
//
// Optionally call with a different base (eg: 8px) to calculate rem.
//
//   rem-calc(16px 32px 48px, 8px);
//
// If you require to comma separate your list
//
//   rem-calc((16px, 32px, 48), 8px);

@function rem-calc($values, $base-value: $rem-base) {
	$max: length($values);
	
	@if $max == 1 { @return convert-to-rem(nth($values, 1), $base-value); }
	
	$remValues: ();
	@for $i from 1 through $max {
		$remValues: append($remValues, convert-to-rem(nth($values, $i), $base-value));
	}
	@return $remValues;
}

@function em-calc($values, $base-value: $rem-base) {
	$remValues: rem-calc($values, $base-value: $rem-base);
	
	$max: length($remValues);
	
	@if $max == 1 { @return strip-unit(nth($remValues, 1)) * 1em; }
	
	$emValues: ();
	@for $i from 1 through $max {
		$emValues: append($emValues, strip-unit(nth($remValues, $i)) * 1em);
	}
	@return $emValues;
}

/// colors black & white
/// @example scss - Usage
///   .my-class {
///     background: black(0.15);
///     color: white(0.9);
///   }
@function black($opacity){
	@return rgba(black, $opacity);
}

@function white($opacity){
	@return rgba(white, $opacity);
}